google/ultima: add new board as variant of cyan baseboard

Add support for google/ultima (Lenovo Yoga 11e G3) as
a variant of the cyan Braswell baseboard.

- Add board-specific code as the new ultima variant

Sourced from Chromium branch firmware-ultima-7287.131.B,
commit 3ef9e73: Revert "Revert "soc/intel/braswell: Put SERIRQ in quiet mode""

Change-Id: Ib38b110f50f4d6ae6eda40e787cd3c1c8dd5ece7
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21576
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
diff --git a/src/mainboard/google/cyan/Kconfig b/src/mainboard/google/cyan/Kconfig
index ea5610b..cf5b8e9 100644
--- a/src/mainboard/google/cyan/Kconfig
+++ b/src/mainboard/google/cyan/Kconfig
@@ -51,6 +51,7 @@
 	default "relm" if BOARD_GOOGLE_RELM
 	default "setzer" if BOARD_GOOGLE_SETZER
 	default "terra" if BOARD_GOOGLE_TERRA
+	default "ultima" if BOARD_GOOGLE_ULTIMA
 
 config MAINBOARD_PART_NUMBER
 	string
@@ -63,6 +64,7 @@
 	default "Relm" if BOARD_GOOGLE_RELM
 	default "Setzer" if BOARD_GOOGLE_SETZER
 	default "Terra" if BOARD_GOOGLE_TERRA
+	default "Ultima" if BOARD_GOOGLE_ULTIMA
 
 config MAINBOARD_VENDOR
 	string
@@ -79,6 +81,7 @@
 	default "variants/relm/devicetree.cb" if BOARD_GOOGLE_RELM
 	default "variants/setzer/devicetree.cb" if BOARD_GOOGLE_SETZER
 	default "variants/terra/devicetree.cb" if BOARD_GOOGLE_TERRA
+	default "variants/ultima/devicetree.cb" if BOARD_GOOGLE_ULTIMA
 
 config VGA_BIOS_FILE
 	string
@@ -109,5 +112,6 @@
 	default "RELM TEST A-A 2323" if BOARD_GOOGLE_RELM
 	default "SETZER TEST A-A 8721" if BOARD_GOOGLE_SETZER
 	default "TERRA TEST A-A 1650" if BOARD_GOOGLE_TERRA
+	default "ULTIMA TEST A-A 6017" if BOARD_GOOGLE_ULTIMA
 
 endif # BOARD_GOOGLE_BASEBOARD_CYAN